status of hybrid target rd at kek-linac t.takahashi hiroshima university april 25 2012 kilc12...
DESCRIPTION
experimental site KEKB LINAC Switch yard 8 GeV e- ~ nc/bunch upto 25Hz single bunch After the earthquake: beam recovered to 3GeV 8 GeV operation expected later half of 2012TRANSCRIPT
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Status of Hybrid target R&D at KEK-LINAC
T.TakahashiHiroshima University
April 25 2012KILC12 大邱廣域市
Collaborators:V. Strakhovenko O. Dadoun, R. Chehab, A.Variola, L. Rinolfi, O. Dadoun,T.Kamitani, T.Suwada, T.Omori, J.Urakawa,K.Furukawa, K.Umemori,M.Satoh,T.Sugimura,S.Kawada, T.Akagi, Y. Uesugi
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Contents
• Status of previous experiments–~ same as LCWS2011
• Temperature measurement 2012 January• Prospects
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experimental site KEKB LINAC
Switch yard
8 GeV e-~ nc/bunchupto 25Hz single bunch
After the earthquake:beam recovered to 3GeV8 GeV operation expected later half of 2012
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Setup
8GeV e- 1mm W crystal
Sweeping Magnet0.96T 0.75m
amorphous W8 mm18 mm
Analyzing magnet5 ~ 30MeV
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pictures
e- 8GeV
W Crystal on the goniometer
Sweeping magnet
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pictures
movable stage
amorphoustargets
thermocoupolesattached back end
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posit
ron
yiel
d (a
rb. u
nit)
angle of crystal axis<111> w.r.t. beam (mr)
rot. in vertical plain
esweep mag
8 mm
Rocking curve
1
2
3.4 0.117.7 0.4
1 2
2 22 21 2
( )f A B Const
same for horizontal rotationPreliminary
factor 3 enhancement
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e+ yield
amorphous thickness [mm]
e+ d
etec
ted
[a.u
]P=20MeV
Need simulation for analyzing the magnet collimator , detector to evaluate e+ yeilds
0 2 4 6 8 10 12 14 16 180
5
10
15
Conventional
Hybrid ON axis
Hybrid OFF axis
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Detector acceptance• Simulation of the is in progress by Y.Uesugi
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Detector acceptance• Simulation of the is in progress by Y.Uesugi
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simulation in progress
Preliminary4 6 8 10 12 14 16 18 20 22
0
200
400
600
800datasimulation
P(MeV)
e+ y
ield
(a.u
.)
18 mm conventional
agreement of data and simulation look finelow acceptance 0.0005e+/e- takes time for simulation
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Temperature measurement w/ thermocouples
back plane of amorphous target thermocouple
approximately 1mm x 1mm
to fast data loggerread temperature each 10ms
bunch by bunch temperature variationPEDD information by thermocouple
temperature at equilibriumtotal energy deposit
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bunch by bunch temp.• dT provides a measure of PEDD
hybrid on axis
conventional
hybrid off axis
Simulation
Measured
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Making thermo couple array
thermocouples
temperature distribution of amorphous targetbunch by bunch bases
design in progress at Hiroshima
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temperature measurementJanuary 2012
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temperature measurement
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summary• Systematic data for hybrid target R&D
– yield from various target thickness– momentum 5, 10, 20 MeV– G4 Simulation in progress
• energy deposit/temperature– Thermocouple array works– in progress. G4 simulation is ready.– Systematic data in next experiments
–( but we need to wait for full recovery of KEKB LINAC)